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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b604438de29760b0c9dae395e2db98f8c8effd80f49b9b7ca5b202317102b1' 
  AND token = '4xM5LWQ/gJ5a7VOwPdvbsUTu0Ft6LiSA5zh8kgE4zhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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