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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14d9f595a7049c61548efa012add0fde916e6cddda729bd1a232729a8904f87' 
  AND token = '/MTcET0oAYLGG+XwsL8CNLGwv/KRTaCa1Y3W9ydJzdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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