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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd361d75e3efbd2b30a1b46e0898a536bf7f8345f62c376c0a412c3ba2dd1c1b5' 
  AND token = 'zIQpIIocmdT1hECTDo2cdLfWCvhvSlbkuDzoxDOTYoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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