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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746a92026677a9f8a4b9097fa4437ca3367bed04e8a9cd7a58ae3b999abb5663' 
  AND token = '+vQFshnNM68a+cWvPe3l/Tz7woO3ovzJRmHflLf5MOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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