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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce3ca7d014b6de19c9e8d874cc31cfcced5f94e251c1f6de5352e5cbdbcb596' 
  AND token = 'pZj3jo2+zYFcOb4BGhjn3gjNSEvcoKsHyNyjrThe5UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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