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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f96e2f178e36865823762d4cbe296cc30267077c10637239986a003c37512f7' 
  AND token = 'cr612K9DX5+oJTo0WotWpIYSYndU5deUHvF59SrSuGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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