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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a5780c33537fb4ec226c7bf4f442147adbd771992c317a3c16b7d6b1ed5980' 
  AND token = 'XCQjtW/9+DxA2VTfEk3VK9Anu7e0xeCpeuGAMya1xTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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