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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5d6083e38e1d54d84a5b66427012a1591c6c0e314eec46dffc15e34a8f16de' 
  AND token = '4sZEGDN/QYWBpt9NM6HoAV0089vTtZE47DQM5YBpNkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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