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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d4c0c58f9b3073c164ba17a9e3ec55f3f953675a7edf3d66132eb7eb5b7621' 
  AND token = 'J/3ezkCQUwKtARyKT1iX84hvPQyCJnxG0ZD1IetpLG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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