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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa341756a1092b5513e0386e86963ad1770ba74b09d71be4e6062e113e56db7' 
  AND token = 'v2UhAtXvhmsEvr72e1wQFI4sExquDmUyil/rv8d/9mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}