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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728cd305608369f78a0c17afec1d3e77371e6039c6f60e9ab5fd8b7efce87e86' 
  AND token = 'uSXfVchovyEB/rzO9xTfsVAFTVX1qZTiTtQk8wOM6JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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