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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded582099ae882a3d7059ae65ce2cda2927033ff2f2324ef09046f0ad4a8540b' 
  AND token = '2SpzVmXnkjn1mTtL2xjzHLOxaBJGSwW4FN5DG9KzPfc=' 
  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"
    }
  }
}