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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62e78a5f22b64b831a9e2e991a4bf7153009bd1993f4bc563020426c368cb33' 
  AND token = 'xA7L0k4lqVf0+3PgT6E1ilsQxRVPHF5kJU/fNHttc9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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