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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c8353ce69884f4dbc8279f6b450eb2724aaa6b76a90a0d33b54e7836955622' 
  AND token = 'lblgwBD+2HhPHXNteSBYxy1gS0Pp++JPyXMweZsx+2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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