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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd425b04e76d966c09a5ae0871a973cd9fc5e32f498d5122707be728fc47fb18' 
  AND token = '3uTkdKyWHkVjIp3GP1Mpr7HRXiGo//8p8P5Mp8e1A3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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