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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cb359d9d49c2e61bcad15f8062443196c461b81b7a7fe2a480f98e14da411a' 
  AND token = '/bFnlqZqx0Jnf+UmOaNPWKG+uwxskuLkWbd67pDQK0o=' 
  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"
    }
  }
}