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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818d7dcd100500e6b192697690da09ae8393d3d18e5ea7765db8d39883f89bee' 
  AND token = 'rh1YeHH4V5H0Dh5gOaHEGaagcRYx7ChzqiV42TgPL1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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