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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03af5de56559899c2760556520724fb68120c1388531254b11f643ba5310cf9' 
  AND token = '8uVWCfRT6Kjl2HEtKoZERinN4rRUfHqgS4y+L6xryCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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