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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3bc3672f7d576f04c8e5c8c3a7b3d1ceba8636014f18230f23b0db780d2437' 
  AND token = '7KXFV2FbgJ+UiLtDwm6Q4uboBcBW/Qu8hNUBy2nzO2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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