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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c48ba20e2dcc73a30c8430a8f283c899cd421c6f6ef0f987ef838cc4308924' 
  AND token = 'HJy3lStAUT0gjsyCpx11PrPsG7967W/ph8fYLnQz6Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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