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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7139c665f10b7c1f4ea9d4e0054b224cab98e91fdd924ac32ecbd842206e4b6a' 
  AND token = 'uL671IVfYRkhqucO/7Dos5m6CP2gczf2OOUH4xuxr24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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