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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f73fa33dc66368f8c8d19229145cdd0516bddf1c8695c03e7d27ee5f656e716' 
  AND token = 'jEkJBVsuTou4ZTabp9egdr/yzFLj9T68Vp0ly55tLJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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