SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8adf04242d92f355ad6029f1b3132fdcffec3f0d27f7dd1b585848782f4c4b5' 
  AND token = 'tbpKHu9yaGmnCXg1Tz8YHjBYASthddkJyM/IPQHK/N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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