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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2d9b04cfece5565de144cd2ca9af4c512c0f6b8cc479cef4587af1445f0513' 
  AND token = '02nw80PqznXb+Aqi+pYCbtAu4BtrgdZb9hAMBI4cit0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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