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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6808e03181b999ba72490fe85e10d0dee21060e537cee4d633de7e716f0004d' 
  AND token = 'c0k+EYVtLrSaBkzIyLk4v/4BvlOUaE1oa/JKdium+Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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