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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef70a817f21cca81dc075d117c5173f4ead9a3548784572efbbda6339fa2d8bd' 
  AND token = 'QkRN+eL4SnSto8I5uCTw938ku77V2DI06N5a0phIrx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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