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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80077ab4547ca5fe6a9d840dc0e2f3b3bc000eac55f3e8b877cc38c5e7ca58c0' 
  AND token = 'gQF4a3gAsXEAk0GzZzoLWxWEkiQmIJoZIrfNEia1aqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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