SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0aa1ca77d4cfdabba57fb529a4f164f1e464b6a3d4453e621bfccb0f9108452' 
  AND token = '+YRBFvO2PVd8M14dKYkGfpaB2AhdzZue/CrBIDpgRD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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