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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2319c5a675e6fb4cc5636bcb6eb333b8049e4af6d676dcce78b930e51bce6586' 
  AND token = 'c8KMRzoof1PF1PA+TMjmuIKX+ULJ+OfPDJ76jj/Gjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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