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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7fedb214bee27b40bf80b9dcd7595b4c427ce2c26c80f733165ec688ed98ef' 
  AND token = 'zb9y+aynJXWazKE9dx+gu5YWlp/HYEdC2v7BONq9Zpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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