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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb49d1b86b92af7f972f6a48f37dd2eb2bbe16b5f5ba6fd7b97b3fc7cb480a3' 
  AND token = 'P5EpJwmkkQlzB3ACqI83kEEEuI6+ndHtcSxb8kz+7ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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