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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4c8c3fbcba86844c123e52a00cc8b5464c0dc8674cc2ba9233fe0e0dcd6faa' 
  AND token = 'ITHvdb/vbFY5m8WMF3LmVLHJWin1vgM4M3/bhn8mgNY=' 
  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"
    }
  }
}