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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41119ea04bd4adbdb9777ed6aa3f6ba6861a5258c6d00df794d7b54d1518a5e' 
  AND token = 'zQPjOPTWZ6veUAUfEUH93ZXzojzv7tjxAtKayfrr8Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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