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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef6f9bdfcde33dbc1762439f8eedc3f6ae9351b7a988b230bfe7622da9b8688' 
  AND token = 'sMMYYGBswMQAqskdgsMI9eF86zrWROWOQaTx8+lz4Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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