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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761f267205594b724da537e25cb8745d223f4ed1fd5e887ae47b3902eb2e1f03' 
  AND token = 'baXT2QIEtZ4wSZcGGDs0d/uC8C9+Lar41a5REqTJvS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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