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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa96c2d12069ca09a030daf52ef0ef0dbc41cb3fd5c9b4b867a1bd7af7235ac' 
  AND token = 'U4zHsaAk3aiVFmdariuvjJt11EulCNQdZwHNJ+NYvDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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