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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57e1a2d86337b7d411f0f3fe0ecd0fd32073ae2dc0242f8187fffd6ac78011d' 
  AND token = 'Tzn0Eq8CoUUXAac0d6Z07o66mCUWeHOfjAoS69zdoKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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