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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc38e76580025daa39825403670eeb9a5a64d79c28aebe7eafa7e1e2f072ee9' 
  AND token = 'Txln7RS9tBdTWDaZ4HS6vDfFE2YP6T70PixBnEHUWXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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