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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c811b4bc2c9605d58243b54e7a773057444b0575c088722283e9c20cb65429' 
  AND token = 'tihG4+AB/iHKsVVKQnvAFAo6sUkwC2U34o/Wb8gnsLY=' 
  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"
    }
  }
}