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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf3b2059175480c194a1696faa1fc106e5de0ceae828aff6e350b2573a864aa' 
  AND token = '4U8anKkfh7bMI2XSlUvTsZjcjTD7Z83waHkU/FEBuPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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