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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4c9c38baff29f267a9cbcb96c97a30b31e4aa4dabe6c8302b685ea1fafb5f2' 
  AND token = 'qoyH37yfPbV6A1HQg5e4u5LC/PZ8Gr6ZN3eK2VhK6os=' 
  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"
    }
  }
}