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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902a4707cd1705641e4d76dbc13505169dda4e9f1d1771a301f0e45193362777' 
  AND token = 'twyRhjx5zRJ3lt34gpAkPjzHmnF9OtbJccsUlvejISs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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