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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2b8bb7ed8a9bfc1cb7b49c5853c60dcb0429036270b949c9420d76bd2ad6f0' 
  AND token = 'XMJQuGPkiSf89ILpqDjpooss9j6AV9RJE1vfk5VAwXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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