Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f204b9bdff1f11220aa47a2ebac4c6c739935d4d9860004a5c02fc92e48da9' 
  AND token = 'FZkm8HndJCdAZ4mB8X9b95Ah+8VH6pfPvi+5AoE0mvI=' 
  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"
    }
  }
}