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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f81e73bf1f21b546f3897d9edf5e8bd245994600441139a8a8373f83a751ea' 
  AND token = '3zPPn95tAUe+lR4OVXheSfdrLHIX5o0RaggamuG9Mt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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