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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5fa34ab3353f6328def0e55ce46e56be45abdcc1bac1dee9f0f7efa4c509fe' 
  AND token = 'H3znsI5IZoZ11ARR75xIIpBpOd7+BGcWoeyWJo2F3E8=' 
  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"
    }
  }
}