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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f3a091b21bb2f72c70e74e99bd36e32fc45fde2f37c77e904b31451337da98' 
  AND token = 'b+tGJ+EpMUOn5lUwKXbj1RfZ3G8KdYd8j1iW3/nxyfA=' 
  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"
    }
  }
}