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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec5651431d0cf575b0a553706e0a6636dff9fef9e1f1544b56a85240b65f1f1' 
  AND token = 'xbxzZNg/gp8bS1/xpVvzyZLQ3lFSB5FyLuM7llbCgpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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