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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf258dd66c169bc097a57e782a89009afa0047510ce3b88cacb8625105f9992' 
  AND token = 'qiClPrwYq4mP3x6G2kirGW/+klsFYjKtyx9rq4hoy+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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