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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1aeb14e42411d4964a547d0a4167b2c841a0ad4aedc9f2f981824ae02e18cae' 
  AND token = '/RWA9l8J6L/zj5UTyIfXlflzGY43cHphvUHmmG1am18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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