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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef69df8dd7cbd770a2f8cfc07500e7f1c06dfd731fd5678a229d5ef21625789e' 
  AND token = 'JetenBtrNASRAH9w7AtzpkS5hOFGVmY/jMK7LJ3Th7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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