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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcacac3a0f85ce1cb653b62af5766320bc17d2b4c1e56bbcddb4d075b0fb3d9' 
  AND token = 'lojWccMGqOpg5QNJEq7NzXO0hHAgSw1Isp7TWcJ7sXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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