Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c86f694d793bfddb53ddc36368d4551a0e52c8c8879d435aca69236aff53ca' 
  AND token = 'hAcL75DVZR304M1UeMspausO/GbllXnsenAZu89qrHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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