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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fb5b0b118af41c86aea9b41982c3a89cfd0375bb37c24a2a833a7f122c3dac' 
  AND token = 'GPe+xM6XlKfQe8nXAP1aLIe1LgUuYiwO3VzZ5IGxp+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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