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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f96ce94428cc9face73c594267a667117d4d6976309b60cdc6b3bf69b23d1a3' 
  AND token = 'IWCvXzPa08mxSDh9n0s/GUgQDbJ4JODvzmidqyNkXw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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