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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb105bbdc2d8b18f0e89e26e2855a4bd512115fc988093666925881351fb9e2' 
  AND token = 'tA3VpGJq0qWqJvE4hA0HQEPol/5gm70PxAgpk+kJT6s=' 
  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"
    }
  }
}