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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60529820bc3d61e4a9dd8a1887826a0a631961529167fba5a1511a4a43918280' 
  AND token = '3r02Dcc5bgugG5OUvpUgEfHEmP8TkKh/UQdA4oclT/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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