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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adf9ddbb92b647081b61b8f322ac3f8a8ff50fdf8bdff08b5a003f86f3a54d4' 
  AND token = 'Ij3p3373G37ktb5xLM5mw23Sad0e0agegAnWwTGTFtI=' 
  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"
    }
  }
}