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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c4bd46dee4e4e49f8cf8e183d3b903cad1c27110af7120b15d1b947b93c231' 
  AND token = 'cDKyDD+c6bXUpeUJBENxPAvli6oqfWref1twY0SOf8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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