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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b79ec808495e6e5a16666e1360549bcdb0249bcf70224319f19acd1f63db70' 
  AND token = '94RpgX02mfpbQ2N3s71ez/xL0tEt3BdYz18bxP5AAyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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