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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e8e1abd3c9304a29c702681fed6e59134bc09e94bc59f9bce3b259ad6397e6' 
  AND token = '0Tu50xp1bQhB5vmOMUxjmHPpY1tyXUgKbFtocU2u9k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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