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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae7c4946eb0173d11183b77721f79e282ceb63b2d86235ca583d5b4e85a2de9' 
  AND token = 'SUC+5e2H6yFGbn0bH75UAwuX+ltkqQhsF02yIuzqWng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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