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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcec464f28fb1f916e26b1457eff452cfb4c7c9a5137122015529e6ba013177' 
  AND token = '0iU+G7ehu6u5qIzrHOdo4Rf/Ws6u5heMdXLtfbLyG14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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