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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3c7ae25b65369abf1af5606b778140992e41a342672dfcec33e8d15cc7fe36' 
  AND token = 'yCtD7I/1KS3lWVYe6RfYO7xOtwAX+nlKrmJaP0La5G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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