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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a0042e7277ceaa24d2772563361330a5672c372550a3e8c56301b75561af17' 
  AND token = 'acNXdwsKN3WKF0nWrQdxichCXLAiCN94jTiJQck8sxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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